<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div ng-app="myApp" ng-controller="myCtrl">
        <input ng-model="name">
        <h1>{{greeting}}</h1>
        <button ng-click="sayHello()">click me</button>
    </div>
    <script src="http://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script>
    <script>
        var app = angular.module('myApp', []);
        app.controller('myCtrl', function($scope) {
            $scope.name = "klren";
            $scope.sayHello = function() {
                $scope.greeting = 'Hello' + $scope.name + '!';
            }
        })
    </script>
</body>

</html>